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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(4/3)*y-(2/y) = 5/3 // - 5/3
(4/3)*y-(2/y)-(5/3) = 0
(4/3)*y-2*y^-1-5/3 = 0
4/3*y^1-2*y^-1-5/3*y^0 = 0
(4/3*y^2-5/3*y^1-2*y^0)/(y^1) = 0 // * y^2
y^1*(4/3*y^2-5/3*y^1-2*y^0) = 0
y^1
(4/3)*y^2+(-5/3)*y-2 = 0
(4/3)*y^2+(-5/3)*y-2 = 0
DELTA = (-5/3)^2-(-2*4*(4/3))
DELTA = 121/9
DELTA > 0
y = ((121/9)^(1/2)-(-5/3))/(2*(4/3)) or y = (-(-5/3)-(121/9)^(1/2))/(2*(4/3))
y = 2 or y = -3/4
y in { -3/4, 2}
y in { -3/4, 2 }
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